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Share-Based Employee Compensation - Roll-forward of Activity for Performance Share Units (Details) - Performance shares - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Number of Share units    
Nonvested number of Units, beginning balance 453  
Granted, number of units 510 453
Vested, number of units 0  
Forfeited, number of units (63)  
Nonvested, Number of Shares, Ending Balance 900  
Weighted Average Grant Date Fair Value    
Nonvested weighted Average Grant Date Fair Value, beginning balance $ 8.20  
Granted, weighted average grant date fair value 7.96 $ 8.20
Vested, weighted average grant date fair value 0.00  
Forfeited, weighted average grant date fair value 8.14  
Nonvested weighted Average Grant Date Fair Value, ending balance $ 8.07 $ 8.20